Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S
The AirTAC SAIJ125X250-10-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 6136N pull and 8590N push force at 0.7 MPa, making it suited for heavy-duty positioning. The integrated magnet works directly with AirTAC CMSE reed and DMSE solid-state sensors fitted into the dual-side barrel grooves.
This model uses a 10mm adjustment mechanism to fine-tune the retract end position, creating a 240-250mm usable travel window. The carbon steel rod and M27x2 thread handle substantial side loads, while the PT tapered port ensures a tight pneumatic seal. The adjuster acts strictly as a travel stop for commissioning precision, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S Is Used
Product Size Changeovers
Dial in the 240-250mm travel window during format changes on automated packaging equipment without physically replacing the cylinder.
Heavy Material Positioning
Leverage the 6136N pull force to push heavy pallets or workpieces into precise machining fixtures on a conveyor line.
Commissioning End-Stop Tuning
Use the 10mm rear stopper screw to fine-tune the exact retract position during initial machine setup, absorbing mechanical tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder lacks thrust, as the 80mm bore only delivers 2513N push at 0.5 MPa compared to the 6136N available here. The 10mm adjustable window is ideal for variable product-size changeovers on a packaging line, allowing you to dial in the exact end-stop without adding external stops or swapping to a fixed-stroke SAI cylinder. For true load-holding without live air pressure, select a SAIL or BSAI cylinder instead, as this rear adjuster only sets the travel endpoint.
For an exact ISO 15552 dimensional interchangeability replacement, match the 125mm bore, 250mm stroke, 10mm adjustment, PT port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting the FB, CA, CB, and CR variants.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X250-10S FAQ
At 0.5 MPa, it delivers 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the 250mm nominal stroke by up to 10mm, providing a 240-250mm usable travel window for fine-tuning at commissioning. It functions as a mechanical stop, not a lock.
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